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[His7] Corazonin, a neurohormone, induces dark color in the cuticle and epidermis of Locusta migratoria[1].

[1] Seiji Tanaka, et al. The dark-color inducing neuropeptide, [His 7]-corazonin, causes a shift in morphometic characteristics towards the gregarious phase in isolated-reared (solitarious) Locusta migratoria. Journal of Insect Physiology 48(11):1065-1074. DOI:10.1016/s0022-1910(02)00199-3